5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver


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The RT9385B is a 5 channel WLED driver with auto mode selection of x1, x1.5 and x2 mode with low dropout voltage in current sources. The RT9385B can power up to 5 white LEDs with regulated constant current for uniform intensity. Each channel (LED1 to LED5) can support up to 25mA. The part maintains highest efficiency by utilizing x1/x1.5/x2 fractional charge pump and low dropout current regulators. An internal 5-bit DAC is used for brightness control. Users can easily configure up to 32 steps of LED current by enable pin.
The RT9385B is available in a WQFN-16L 2x3 package. Small 1μF capacitors can be used for fly capacitors. It provides the best backlighting solution with high efficiency and smallest board space for portable application.


  • Camera Phone, Smart Phone
  • White LED Backlighting
Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 4.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 5
Iout (max)/channel (mA) 25
Iq (typ) (mA) 1
Dimming Control Pulse
Topology Charge Pump
Features 100% Duty Cycle;Enable Input;OVP;SCP;Stable with Ceramic Capacitor;UVP
Package Type WQFN2x3-16
  • 85% Average Efficiency Over Li-ion Battery Discharge
  • Support Up to 5 White LEDs
  • Support Up to 25mA/Per Channel
  • Support Up to 125mA Output Current
  • Flexible 32 Step Brightness Control
  • 60mV Current Source Dropout
  • 1% LED Current Accuracy
  • 0.7% LED Current Matching
  • Automatic x1/x1.5/x2 Charge Pump Mode Transition
  • Low Input Noise and EMI Charge Pump
  • 5V Over Voltage Protection
  • Power On/Mode Transition Inrush Protection
  • 1MHz Frequency Oscillator
  • 0.4μA Low Shutdown Current
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver2008/12/12
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9385BGQWWQFN2x3-161500 Not available Buy from Distributor